The Application Exchange (APEX) Access Service
RFC 3341

Document Type RFC - Historic (July 2002; No errata)
Last updated 2015-10-14
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IESG IESG state RFC 3341 (Historic)
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Network Working Group                                            M. Rose
Request for Comments: 3341                  Dover Beach Consulting, Inc.
Category: Standards Track                                       G. Klyne
                                                  Clearswift Corporation
                                                              D. Crocker
                                             Brandenburg InternetWorking
                                                               July 2002

             The Application Exchange (APEX) Access Service

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2002).  All Rights Reserved.

Abstract

   This memo describes the Application Exchange (APEX) access service,
   addressed as the well-known endpoint "apex=access".  The access
   service is used to control use of both the APEX "relaying mesh" and
   other APEX services.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Use and Management of Access Information . . . . . . . . . . .  3
   2.1 Querying Access Information  . . . . . . . . . . . . . . . . .  3
   2.2 Retrieval of Access Information  . . . . . . . . . . . . . . .  4
   2.3 Update of Access Information . . . . . . . . . . . . . . . . .  5
   3.  Format of Access Entries . . . . . . . . . . . . . . . . . . .  9
   3.1 Finding the Appropriate Entry: Matching Owners and Actors  . . 11
   3.2 Creating and Updating Access Entries . . . . . . . . . . . . . 14
   4.  The Access Service . . . . . . . . . . . . . . . . . . . . . . 14
   4.1 Use of XML and MIME  . . . . . . . . . . . . . . . . . . . . . 15
   4.2 The Query Operation  . . . . . . . . . . . . . . . . . . . . . 16
   4.3 The Get Operation  . . . . . . . . . . . . . . . . . . . . . . 17
   4.4 The Set Operation  . . . . . . . . . . . . . . . . . . . . . . 18
   4.5 The Reply Operation  . . . . . . . . . . . . . . . . . . . . . 20
   5.  Registration: The Access Service . . . . . . . . . . . . . . . 20
   6.  The Access Service DTD . . . . . . . . . . . . . . . . . . . . 21

Rose, et. al.               Standards Track                     [Page 1]
RFC 3341     The Application Exchange (APEX) Access Service    July 2002

   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 23
       References . . . . . . . . . . . . . . . . . . . . . . . . . . 23
       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 24
   A.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 25
       Full Copyright Statement . . . . . . . . . . . . . . . . . . . 26

1. Introduction

   This memo describes an access service that is built upon the APEX [1]
   "relaying mesh".  The APEX access service is used to control use of
   both the relaying mesh and other APEX services.

   APEX, at its core, provides a best-effort datagram service.  Within
   an administrative domain, all relays must be able to handle messages
   for any endpoint within that domain.  APEX services are logically
   defined as endpoints but given their ubiquitous semantics they do not
   necessarily need to be associated with a single physical endpoint.
   As such, they may be provisioned co-resident with each relay within
   an administrative domain, even though they are logically provided on
   top of the relaying mesh, i.e.,

      +----------+     +----------+    +----------+    +---------+
      |   APEX   |     |   APEX   |    |   APEX   |    |         |
      |  access  |     | presence |    |  report  |    |   ...   |
      | service  |     |  service |    | service  |    |         |
      +----------+     +----------+    +----------+    +---------+
           |                |               |               |
           |                |               |               |
   +----------------------------------------------------------------+
   |                                                                |
   |                            APEX core                           |
   |                                                                |
   +----------------------------------------------------------------+

   That is, applications communicate with an APEX service by exchanging
   data with a "well-known endpoint" (WKE).

   APEX applications communicate with the access service by exchanging
   data with the well-known endpoint "apex=access" in the corresponding
   administrative domain, e.g., "apex=access@example.com" is the
   endpoint associated with the access service in the "example.com"
   administrative domain.

   Note that within a single administrative domain, the relaying mesh
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